Edexcel AS Level Maths: 9.1 The Cosine Rule

Pearson A level maths pure maths year 1 textbook (9.1)

In this video I cover:

1. The cosine rule
2. Finding the missing side and angle of a triangle using the cosine rule
3. Solving problems involving the cosine rule
4. Bearings

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[hamzamiah]

I never thought I'd live to see the day

[monadude]

Thank you for all your videos. They're the best by far on YouTube for learning A Level maths

[ebude]

sir, wouldn’t the last answer be 108° though?

[sugu]

5:32 what does the right hand side mean in this